Dielectric properties and point defect behavior of antimony oxide doped Ti deficient barium strontium titanate ceramics

作者：Zhang, Chen^*; Ling, Zhi-xin; Jian, Gang; Chen, Fang-xu

来源：Transactions of Nonferrous Metals Society of China, 2017, 27(12): 2656-2662.

DOI：10.1016/S1003-6326(17)60294-2

• barium strontium titanate
• defects
• dielectric properties
• non-stoichiometric ceramics

The microstructures and dielectric properties of Sb2O3-doped Ti deficient barium strontium titanate ceramics prepared by solid state method were investigated with non-stoichiometric level and Sb2O3 content by SEM, XRD and LCR measure system. It is found that with the increase of d, (Ba0.75Sr0.25)Ti1-delta O3-2 delta ceramics transform from single phase solid solutions with typical cubic perovskite structure to multiphase compounds while (Ba0.75Sr0.25)Ti0.998O2.996 ceramics remain to be single-phase with the increasing Sb2O3 content. The distortion of the ABO(3) perovskite lattice caused by V-Ti '''' and V-O(center dot center dot) induces the drop of Curie temperature and the rise of relative dielectric constant in (Ba0.75Sr0.25)Ti1-delta O3-2 delta ceramics with increasing d value. The orientation of V-O(center dot center dot) elastic dipoles results in the domain-wall pinning and thus the reduction of the dielectric loss. With increasing Sb2O3 content, the relative dielectric constant, dielectric constant maximum and Curie temperature of (Ba0.75Sr0.25)Ti0.998O2.996 ceramics decrease dramatically while the dielectric loss increases.

• 出版日期2017-12
• 单位江苏科技大学